Agree with taking him to either an open house at a school he’s thinking he’ll be going to or set an appointment with the admissions officer. My friend did this with her son, who was in a high school IB program. The AO just looked at him and said “You’re not getting in here with those grades.” Kid did a 180 and did go to that school, as did his younger brother and sister who learned from the oldest and never let their grades fall.
I have a friend with a similar situation. GPA is 3.1, ACT is 34. I think he’ll get into engineering programs, but it won’t be as easy as it would have been if he’d turned in some homework and worked a little harder.